What happens when users see an error 1250 displaying on their Canon Printers? The Canon Printer Error Code 1250 takes place when the paper output tray is closed. Your Canon printer won’t start printing till the paper tray is not open. You can always get a Canon Printer Support for Code 1250 from us at a single call. You can call us on a toll-free number +1(877) 579-1988.